. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 28 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. continuing for some weeks to produce great numbers of conidia which come to form masses perhaps 1 mm. in thickness. Conidiiferous cells 8-10 by 2-3/f. Conidia elliptical to globose 2 by or , green, homogeneous, persisting in chains when mounted. Colonies begin to liquefy gelatin slowly after about 10 days and continue until it is completely liquefied. Grows readily and rapidly upon all com- mon media. Occurs ch
. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 28 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. continuing for some weeks to produce great numbers of conidia which come to form masses perhaps 1 mm. in thickness. Conidiiferous cells 8-10 by 2-3/f. Conidia elliptical to globose 2 by or , green, homogeneous, persisting in chains when mounted. Colonies begin to liquefy gelatin slowly after about 10 days and continue until it is completely liquefied. Grows readily and rapidly upon all com- mon media. Occurs characteristically upon decaying apples-and other pomaceous fruits, where old colonies often produce coremia 1 cm. or more in length and very large. Collected at Ithaca and Geneva (Eustace), N. Y., at Middletown and Storrs, Conn., upon apples; upon pears and Mespilus at Hanover, Germany. Often appears as a contamination in fungous Fig. l.—Penicillium expansum Link: a, b,f, branching and arrangement of branches of conidial fructifi- cation (X 900); c, d, e, conidiiferous cells and conidial chains (X 900); g, ft, j, k, I, sketches of fructifica- tion (X 140); m, n, o, germination of conidia (x 900); r, s, sketches from photomicrographs, showing in s loose aggregations of conidiophores beginning to develop in zones which become coremia like r (coremium r was 1 mm. in height; X 35). Many references in the literature to P. glaucum Link and P. crusta- ceum (L.) Fries refer to this species. Unless, however, such citations directly refer to the presence of coremia, or to the association of the organism with the decay of pomaceous fruits, or both, there is no means of fixing the application of such names to this species. Since Link11 in 1824 lumped into his specie's P. glaucum every kind of green. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
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